Fastener applying tool



Aug. 29, 1944.

H. W. KOST FASTENER APPLYING TOOL Filed Sept. 6, 1943 Harold hiya/Z WM M awn M 3 Patented Aug. 29, 1944 FASTENER APPLYDIG TOOL Harold W. Kost, Birmingham, Mich, assignor to Detroit Harvester Company, Detroit, Mich., a corporation of Michigan Application September 6, 1943, Serial No. 501,401

2 Claims.

This invention relates to tools particularly for use in connection with the application of sheet fasteners or so-called skin clamps to the work, fasteners of this type being widely used in the aircraft industry.

creating a very dangerous hazard.

drawing in which slidable relative to a nozzle N. ply the fastener to the work,

shown on Figure 2.

The fastener applying prises a plunger end against the plunger part I4 which is in sliding contact with the nose portion of the tool.

The forward end of the guide 3i is substantially end of the hood L. The portion 35 of the guide 3i is so formed as substantially to embrace a on end of said engaging plunger fastener engaging [slidable ider in the ainst which 5 portion of the peripheral surface of the fastener Heretofore in the application of skin clamps, hood L, thereby to militate against lateral disdanger has been encountered due to the fact that placement of the tool. the fasteners, after being partially compressed, It will be manifest that by operating the trigsometimes slip loose from the tool. The springs ger i3, the tool plunger 30 is advanced through of these fasteners are of such strength that, when the apertured end of the fastener hood L thereby they come loose from the applying tool, the par-- to compress the fastener plunger M to apply tially or fully compressed springs cause them to the fastener to the work. The coil spring 33 esbe thrown with the force of a bullet, thereby tablishes a resilient pressure against the inner end of the fastener, which pressure increases as.

An object is to produce a tool of the above the plunger is advanced, thus insuring the re-- character by which the actuating plunger is retention of the fastener in the desired position. tained in alignment with the fastener thereby to It is to be understood that numerous changes insure the emcient and proper operation of the in details of construction, arrangement and opfastener while it is being applied to the work. eration may be effected without departing from Another object is to produce a tool of the above the spirit .of the invention especially as defined character which has the safety feature above in the appended claims. mentioned and also is adapted to accommodate What I claim is: fasteners of the type in which the head of the 1. A tool for applying a fastener provided with fastener is substantially enclosed except for a a spring tensioned pin reciprocable in a housing relatively small opening by which access is afhaving an external shoulder, said tool comprising forded to the spring tensioned pin or plunger. a frame providing a guideway.

Other objects and advantages of the invention frame providing a trough-like portion, a plunger W ll hereinafter pp n f r P rp s 01' llreciprocable in said guideway, means for actuatlustration but not of limitation, embodiments of mg said plunger, said plunger having a pin-like the invention are shown in the accompanying projection, a cup-shaped fastener member having a central aperture through which F ur 1 is a side l vat n f a as n r apsaid pin-like projection is slidable, a spring be- P y g tool p rti arly adapted S n a p tween said plunger and said cup-shaped member. in which the end of the plunger is enclosed; and and a shoulder in the region of said trough- Figure 2 is a sectional view of the tool shown like portion against which the shoulder on the in Figure 1 w h the n r n amp in fastener is adapted to abut with the spring-tenplace and the tool plunger advanced preparatory sioned pin of the fastener facing the to applying the fastener to the work. whereby the pin is advanced against the As Shown 0n Figures 1 n e f st n r pspring tension upon advancing movement of the plying tool is particularly designed for use with 40 plunger.

a fastener or skin clamp in which the inner end 2. A tool for applying a fastener provided with of the plunger is partially enclosed. Reference a spring tensioned pin reciprocable in a housing is made to my co-pending application Serial No. having an external shoulder, said tool comprising 497,319, filed August 4, 1943, and entitled Tema frame providing a guideway. ne end of Said porary rivet." In this fastener, a hood L is fixed frame providing atrough-like portion, a plunger at its outer end to the body of the fastener above reciprocable in said guideway, means for actuatdescribed, the plunger M has a reduced extension ing said plun er, a socketed terminating in a shouldered portion A which is member shaped snugly tom the adjacent end of In order to apthe fastener, said member having an axial openth plunger M is ing. an extension on said plunger first depressed to a position substantially as through said opening, and being movable relatively to said member, a coil spring interposed tool illustrated combetween said plunger and said member and fit- 30 which is of a size to pass ting over said extension, and a she through the aperture in the inner end of the m- 56 e i n o aid tr ushike' po tio a tener hood L. The plunger. is slidable relative the shoulder on the fastener is adapted to abut to a guide 3| which is formed with a reduced with the/pin of the fastener facing l l er rearward extension 32 and a coil spring 83 fits the where y th Pin is ad n ed against the prin extension 32 at one end and bears at its inner 6o tension upon advancing movement of the p unger.

EAR OLD w. KOS'I. 

